Electronic Device Comprising Display

4. The electronic device of claim 1, wherein the processor includes at least one of: an application processor (AP), a communication processor (CP), a sensor hub or a touch panel circuit, or a module including a micro controller unit (MCU).

5. The electronic device of claim 1, wherein information on the second time period and the second number is received from the processor and/or stored in the display driver IC.

6. The electronic device of claim 1, wherein the vertical blank lines include a vertical front porch (VFP) and a vertical back porch (VBP), and the display driver IC is configured so that when the number of the vertical blank lines is changed from the first number to the second number, a rate of change of VFP is greater than a rate of change of VBP.

7. The electronic device of claim 1, wherein a ratio of the first refresh rate to the second refresh rate is less than a ratio of the second time period to the first time period.

8. The electronic device of claim 1, wherein a ratio of the first refresh rate to the second refresh rate is greater than a ratio of the second number to the first number.

9. The electronic device of claim 1, wherein the display driver IC is configured to change the number of vertical blank lines and/or the output time during a time interval between consecutive frames when the first refresh rate is changed to the second refresh rate.

11. The electronic device of claim 10, wherein the processor is configured to change a time period that is the output time.

13. The electronic device of claim 1, wherein the processor is configured to control the display driver IC to switch from the first refresh rate to the second refresh rate based at least on at least one of: a user input, a change in communication state, and a change in option of a running application.